Gyres working great on my tanks. 250s on each end, up near water surface. Pulse mode, 0.9 s., B running opposite of A. Tank is five feet long and this setting creates a nice wave action. On a three foot frag tank, I have one Icecap 3000 set on pulse, 0.7 s, 30%, at 100% the wave will almost splash out. You just have to get the pulse at the right freq for the dimensions of each tank. ... and you have learn how to unassemble, clean, and reassemble. Seems as though engineering flaws in the early model are being addressed in more recent versions (e.g. weak cord, weak adapters between magnet spindle and gyre). much beefier now.